双微乳液法制备掺杂Fe^(3+)的纳米TiO_2及其光催化性能  

Fe^(3+) Doped TiO_2 Nano-particles Prepared by Double Microemulsion Method and Photocatalytic Activity

作　　者：王晶晶[1] 王剑波[1] 卢寿慈[2] 

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《中国粉体技术》2012年第3期40-43,共4页China Powder Science and Technology

基　　金：安徽省教育厅自然科学基金项目;编号:KJ2009A121

摘　　要：为了研究双微乳液法在制备纳米级光催化剂的应用,以TiCl4和NH3.H2O为原料,采用十六烷基三甲基溴化铵-正丁醇-环己烷-水微乳体系制备Fe3+掺杂纳米TiO2,对粉末的晶体结构进行X射线衍射表征,并以其对p-甲酚的降解考察其光催化活性。结果表明,在较小的掺杂量时,Fe3+掺杂量的提高可以提高TiO2的光催化活性,进一步提高掺杂量将引起光催化活性的降低;掺杂Fe3+可导致纳米TiO2的粒径减小;Fe3+的半径较小以及Fe2O3的熔点较低均有利于TiO2从锐钛矿向金红石的相变;当Fe3+掺杂摩尔分数为0.06%,煅烧温度为550℃时,纳米TiO2的光催化活性最高,此时形成TiO2的锐钛矿和金红石相的混晶;乳液中含水量也会影响晶相的组成和粒径大小,随着含水量增加产物中出现了一定比例的金红石相。In order to research the application of double microemulsion method for preparing nano-sized catalysts, Fe^3＋doped TiO2 nano-particles were obtained in microemulsion of CTAB-butanol-cyclohexane-H2O with TiCI4 and NH3.H2O as raw meterials. The crystal structure of Fe^3＋ doped TiO2 nano-particles was characterized by XRD and the degradation ofp-cresol was investigated for the photocatalytic activity of them. The results show that the photocatalytic activity increases with the increasing doping content of Fe^3＋ in a certain range and decreases with further increasing of doping content. The doped Fe^3＋ ions lead to decrease the particle size of TiO2 nano-particles. The small radius of Fe^3＋ and low melting point of Fe2O3 can promote the phase transitions of anatase to rutile. When the doping molar fraction of Fe^3＋ is 0.06%, Fe^3＋ doped TiO2 nano-partieles calcined at 550 ℃ show the highest photocatalytic activity and emerge the mixed crystal of anatase and rutile

关 键 词：双微乳液 掺杂 纳米粉体 光催化 

分 类 号：O643.3[理学—物理化学]